Improvement in rotary pumps



UNITED STATES NATHAN E. NASH, OF PROVIDENCE, RHODE ISLAND.

IMPROVEMENT IN ROTARY PUMPS.

- Specification forming part of Letters Patent No. 130,146, dated August 6, 1872.

To all whom it may concern:

Be it known that I, NATHAN E. NASH, of the city and county of Providence, in the State of Rhode Island, have made certain new and useful Improvements in Pumps or Blowers, and I do hereby declare that the following specification, taken in connection with the drawing making a part of the same, is a full, clear, and exact description thereof.

Figure 1 is a view of a pump or blower in elevation. Fig. 2 is a section of same, with a portion removed, on line 00 m. Fig. 3 is a section on line 3 y. Fig. 4 is a section view of the piston, showing the buckets attached to the rings. Fig. 5 shows a side and section view of the rings.

My improvements relate to what is known as a rotary pump or blower; and consists in the manner of constructing and actuating the blades, and in theuse of a packing in connection therewith, as hereinafter described.

In the rotary pumps now in use the cylinder A, which revolves within and eceentrically to the hollow cylinder B, is provided with blades 0 and c, which are actuated by springs, the whole being constructed and operating in amanner well understood. The blades, when actuated from the inner ends by a spring in the usual way, will of course bear harder upon the circumference of the cylinder B at certain points than at others, which tends to wear the cylinder into what might be called an egg shape. For instance, the blade 0, as shown in Fig. 2, has reached its most extended position, and as it moves upward and is forced back into the cylinderA its pressure upon the inner circumference of the cylinderB is much greater than during the other half of its revolution.

To overcome this difficulty I dispense with all springs and make use of two circular rings, at d, at each end of the cylinder B, to which rings I hinge the blades 0 and c at both ends. It will now be readily seen that the rings d and d will revolvegvith the cylinder A and within the cylinder B, and will actuate the blades the same as the spring, and at the same time preserve the cylinder from wear at any particular point and allow it to retain its exact circular shape.

In the pumps now in use the blades have been allowed to come in contact with the inner circumference of the cylinder B, so that whenever they become worn from constant use, in order to repair the blades or supply new ones, it became necessary to take the pump to pieces. In my invention I make the edge of the blade of suitable shape to receive a packing, c, which is held sufiiciently secure between the blade and the cylinder, and may be put in or taken out by simply removing the end cap and rings d and d whenever a new packing is required.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The blades, actuated from their outer ends by means of the rings d and d, in the manner substantially as described, for the purposes specified.

2. The combination of the cylinders A and B and the rings d and d, the whole constructed and operating together in the manner substantially as described, for the purposes specifled.

NATHAN E. NASH.

Witnesses:

WALTER B. VINCENT, JonN DEW. TAYLOR. 

